How to Format a Double into Currency - Swift 3

How to format a Double into Currency - Swift 3

You can use this string initializer if you want to force the currency to $:

String(format: "Tip Amount: $%.02f", tipAmount)

If you want it to be fully dependent on the locale settings of the device, you should use a NumberFormatter. This will take into account the number of decimal places for the currency as well as positioning the currency symbol correctly. E.g. the double value 2.4 will return "2,40 €" for the es_ES locale and "¥ 2" for the jp_JP locale.

let formatter = NumberFormatter()
formatter.locale = Locale.current // Change this to another locale if you want to force a specific locale, otherwise this is redundant as the current locale is the default already
formatter.numberStyle = .currency
if let formattedTipAmount = formatter.string(from: tipAmount as NSNumber) {
    tipAmountLabel.text = "Tip Amount: \(formattedTipAmount)"
}

Formatting a negative Double into currency in Swift

Use NumberFormatter:

import Foundation

extension Double {
    var formattedAsLocalCurrency: String {
        let currencyFormatter = NumberFormatter()
        currencyFormatter.usesGroupingSeparator = true
        currencyFormatter.numberStyle = .currency
        currencyFormatter.locale = Locale.current
        return currencyFormatter.string(from: NSNumber(value: self))!
    }
}

print(0.01.formattedAsLocalCurrency) // => $0.01
print(0.12.formattedAsLocalCurrency) // => $0.12
print(1.23.formattedAsLocalCurrency) // => $1.23
print(12.34.formattedAsLocalCurrency) // => $12.34
print(123.45.formattedAsLocalCurrency) // => $123.45
print(1234.56.formattedAsLocalCurrency) // => $1,234.56
print((-1234.56).formattedAsLocalCurrency) // => -$1,234.56

Converting String to Currency Swift

You don't need to replace any any characters using regex. Just use NSNumberFormatter

extension String {
    // formatting text for currency textField
    func currencyFormatting() -> String {
        if let value = Double(self) {
            let formatter = NumberFormatter()
            formatter.numberStyle = .currency
            formatter.maximumFractionDigits = 2
            formatter.minimumFractionDigits = 2
            if let str = formatter.string(for: value) {
                return str
            }
        }
        return ""
    }
}

---

"74154.7".currencyFormatting()            // $74,154.70

"74719.4048014544".currencyFormatting()   // $74,719.40

How to get the Currency formatter with decimal and grouping separator in swift using ISOCode

The error comes from the way you cast your value to Int:

Int(1234567.89)


This rounds your floating-point value to 1234567 even before passing it to setAmountString.

Try casting it to Float instead, or not casting it at all. You also need to change your function signature from

func setAmountString (amountValue: Int, isoCodeStr: String)


to

func setAmountString (amountValue: Float, isoCodeStr: String)


Rounding a double to 2 decimal places in Swift, XCode 12

You could do it directly inside Text with the help of string interpolation:

struct ContentView: View {
    let decimalNumber = 12.939010

    var body: some View {
        Text("\(decimalNumber, specifier: "%.2f")")//displays 12.94
    }
}

Swift convert Currency string to double

NumberFormatter can convert to and from string. Also Double cannot represent certain numbers exactly since it's based 2. Using Decimal is slower but safer.

let str = "$4,102.33"

let formatter = NumberFormatter()
formatter.numberStyle = .currency

if let number = formatter.number(from: str) {
    let amount = number.decimalValue
    print(amount)
}

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